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The extension offers some features for the user to more easily customize the buttons. The CustomizationButton
opens a menu, from which the user can add or remove buttons of the toolbar.
<ol>
	<li>The ToolbarGroupDockStation can show a header. The header can be any kind of Component and is 
	customized using the property key ToolbarGroupDockStation.HEADER_FACTORY.</li>
	<li>The extension offers the header CustomizationButton which opens the menu</li>
	<li>The contents of the menu have to be set up by the client, almost any Component can be shown in the menu.</li>
</ol> 
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